Q.Explain VoIP.

Voice over Internet Protocol (VoIP) is a technology that enables voice communication and multimedia sessions to be transmitted over the Internet or any IP-based network, rather than through traditional circuit-switched telephone lines. Instead of using dedicated copper wires for each call, VoIP converts analog voice signals into digital data packets, which are then routed across the network using the same infrastructure that carries emails, web pages, and other internet traffic.

The process works in three main steps:

• Digitization: The speaker's voice is captured by a microphone and converted from analog sound waves into digital data.
• Packetization: The digital data is compressed and broken into small packets, each tagged with addressing information.
• Transmission: These packets travel independently across the IP network to the recipient, where they are reassembled, decompressed, and converted back into audible sound. …

The telephone system that dominated the twentieth century relied on dedicated copper wires and circuit-switched networks. When you made a call, a physical circuit connected you to the other person for the entire conversation, reserving that pathway whether you were speaking or silent. VoIP represents a fundamental break from this model. Instead of maintaining a continuous circuit, it treats your voice as data—no different in principle from an email or a web page—and sends it across the internet in small, efficient packets.

The process begins with your voice. When you speak into a VoIP-enabled device—a computer headset, a smartphone app, or a specialized VoIP phone—an analog-to-digital converter samples your voice thousands of times per second and translates those sound waves into binary code. This digital stream is then compressed to reduce bandwidth, broken into packets (each tagged with routing information), and sent across the internet using Internet Protocol. At the receiving end, the packets are reassembled, decompressed, and converted back into sound waves that the listener hears. All of this happens in fractions of a second.

What makes VoIP economically compelling is its efficiency. Traditional phone networks waste capacity because a circuit remains open even during pauses in conversation. VoIP packets, by contrast, share network infrastructure with all other internet traffic. The same fiber-optic cable carrying your video stream or file download can simultaneously carry dozens of voice conversations. This shared infrastructure dramatically reduces the cost per call, especially for long-distance and international communication, which is why VoIP services often offer these at rates far below traditional carriers or even free.

The technology supports a range of implementations:

• Software-based calling: Applications like Skype, WhatsApp, Zoom, and Microsoft Teams run on computers and smartphones, turning any internet-connected device into a telephone.
• VoIP phones: Physical handsets that look like traditional phones but connect to your internet router instead of a phone jack.
• Hybrid systems: Adapters that let you plug a conventional telephone into your broadband connection, converting analog signals to VoIP on the fly.